यदि $y = \operatorname{Tanh}^{-1} \sqrt{\frac{1-x}{1+x}}$ है,तो $\frac{dy}{dx} = $

  • A
    $-\frac{1}{2 \sqrt{1-x^2}}$
  • B
    $\frac{-1}{2 x \sqrt{1-x^2}}$
  • C
    $\frac{2}{1+x^2}$
  • D
    $\frac{1}{2 \sqrt{1+x^2}}$

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